<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="isAll" @click="allFn" />
            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <myTr
          @delFn="delFnHandler"
          v-for="(item, index) in goodList"
          :key="index"
          :goodList="goodList[index]"
        ></myTr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ total }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import myTr from "./components/myTr";
export default {
  components: {
    myTr,
  },
  computed: {
    isAll() {
      return this.goodList.every((ele) => ele.checked);
    },
  },
  watch: {
    goodList: {
      deep: true,
      handler(value) {
        this.total = 0;
        value
          .filter((ele) => ele.checked)
          .forEach((ele) => (this.total += ele.price * ele.num));
      },
    },
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
      total: 0,
    };
  },
  methods: {
    allFn() {
      if (this.isAll) {
        return this.goodList.forEach((ele) => (ele.checked = false));
      }
      this.goodList.forEach((ele) => (ele.checked = true));
    },
    delFnHandler(delName) {
      this.goodList = this.goodList.filter((ele) => ele.name !== delName);
    },
  },
};
</script>

<style>
</style>